diff --git a/DS/C/Lab/Week2/StringHandler.c b/DS/C/Lab/Week2/StringHandler.c
new file mode 100644
index 0000000..7b0bad5
--- /dev/null
+++ b/DS/C/Lab/Week2/StringHandler.c
@@ -0,0 +1,119 @@
+#include <stdio.h>
+
+int string_length(char str[]) {
+    int length = 0;
+    while (str[length] != '\0') {
+        length++;
+    }
+    return length;
+}
+
+void string_concatenate(char str1[], char str2[], char result[]) {
+    int i = 0, j = 0;
+    while (str1[i] != '\0') {
+        result[j++] = str1[i++];
+    }
+    i = 0;
+    while (str2[i] != '\0') {
+        result[j++] = str2[i++];
+    }
+    result[j] = '\0';
+}
+
+int string_compare(char str1[], char str2[]) {
+    int i = 0;
+    while (str1[i] != '\0' && str2[i] != '\0') {
+        if (str1[i] != str2[i]) {
+            return (str1[i] < str2[i]) ? -1 : 1;
+        }
+        i++;
+    }
+    if (str1[i] == '\0' && str2[i] == '\0') {
+        return 0;
+    } else if (str1[i] == '\0') {
+        return -1;
+    } else {
+        return 1;
+    }
+}
+
+void string_insert(char str[], char substr[], int pos, char result[]) {
+    int i = 0, j = 0, k = 0;
+    int str_length = string_length(str);
+    int substr_length = string_length(substr);
+
+    while (i < pos && i < str_length) {
+        result[j++] = str[i++];
+    }
+    while (substr[k] != '\0') {
+        result[j++] = substr[k++];
+    }
+    while (i < str_length) {
+        result[j++] = str[i++];
+    }
+    result[j] = '\0';
+}
+
+void string_delete(char str[], int pos, int length, char result[]) {
+    int i = 0, j = 0;
+    int str_length = string_length(str);
+
+    while (i < pos && i < str_length) {
+        result[j++] = str[i++];
+    }
+    i += length;
+    while (i < str_length) {
+        result[j++] = str[i++];
+    }
+    result[j] = '\0';
+}
+
+int main() {
+    char str1[100], str2[100], result[200];
+    int choice, pos, length;
+
+    printf("Enter the first string: ");
+    scanf("%99s", str1);
+    printf("Enter the second string: ");
+    scanf("%99s", str2);
+
+    printf("\nChoose an operation:\n");
+    printf("1. Length of the first string\n");
+    printf("2. Concatenate strings\n");
+    printf("3. Compare strings\n");
+    printf("4. Insert second string into first string at position\n");
+    printf("5. Delete substring from first string\n");
+    printf("Enter your choice: ");
+    scanf("%d", &choice);
+
+    switch (choice) {
+        case 1:
+            printf("Length of the first string: %d\n", string_length(str1));
+            break;
+        case 2:
+            string_concatenate(str1, str2, result);
+            printf("Concatenated string: %s\n", result);
+            break;
+        case 3:
+            printf("String comparison result: %d\n", string_compare(str1, str2));
+            break;
+        case 4:
+            printf("Enter position to insert the second string: ");
+            scanf("%d", &pos);
+            string_insert(str1, str2, pos, result);
+            printf("String after insertion: %s\n", result);
+            break;
+        case 5:
+            printf("Enter position to start deletion: ");
+            scanf("%d", &pos);
+            printf("Enter length of substring to delete: ");
+            scanf("%d", &length);
+            string_delete(str1, pos, length, result);
+            printf("String after deletion: %s\n", result);
+            break;
+        default:
+            printf("Invalid choice.\n");
+    }
+
+    return 0;
+}
diff --git a/DS/C/Lab/Week2/StringHandling.c b/DS/C/Lab/Week2/StringHandling.c
new file mode 100644
index 0000000..b5be671
--- /dev/null
+++ b/DS/C/Lab/Week2/StringHandling.c
@@ -0,0 +1,139 @@
+#include <stdio.h>
+
+int string_length(char string[])
+{
+    int i;
+    for(i=0; string[i]!='\0'; i++);
+    return i;
+}
+
+void string_concat(char str1[], char str2[])
+{
+    int i,j;
+    char str5[100];
+
+    for(i=0;str1[i]!='\0';i++)
+        str5[i]=str1[i];
+
+    str5[i] = '\0';
+
+    for(i=string_length(str5),j=0;str2[j]!='\0';i++,j++)
+        str5[i]=str2[j];
+
+    str5[i] = '\0';
+
+    printf("Joining Strings 1 and 2, we get: %s\n",str5);
+}
+
+void string_comp(char str1[], char str2[])
+{
+    int i;
+
+    for(i=0;str1[i]!='\0' || str2[i]!='\0' ;i++){
+        if(str1[i]>str2[i]){
+            printf("The first string is greater than the second.\n");
+            break;
+        }else if(str1[i]<str2[i]){
+            printf("The second string is greater than the first.\n");
+            break;
+        }
+    }
+}
+
+void string_insert(char str1[], char str2[], int pos)
+{
+    int i,j;
+    char str6[100];
+
+    if(pos > string_length(str1)){
+        printf("Invalid Position.");
+        return;
+
+    }else{
+
+        for(i=0;i<pos;i++){
+            str6[i]=str1[i];
+        }
+
+        for(i=pos,j=0;str2[j]!='\0';i++,j++){
+            str6[i]=str2[j];
+        }
+
+        for(i=pos+string_length(str2),j=pos;str1[j]!='\0';i++,j++){
+            str6[i]=str1[j];
+        }
+
+        str6[i]='\0';
+
+        printf("The new modified string is: %s \n", str6);
+
+        }
+}
+
+void string_destroy(char str1[], char str3[], int pos)
+{
+    int i, j, str3_len = string_length(str3);
+
+    if (pos < 0 || pos >= string_length(str1)) {
+        printf("Invalid Position.\n");
+        return;
+    } else if (str3_len > string_length(str1 + pos)) {
+        printf("Deletion substring is too long.\n");
+        return;
+    } else {
+        for (i = pos, j = 0; j < str3_len; i++, j++) {
+            if (str1[i] != str3[j]) {
+                printf("The substring doesn't match.\n");
+                return;
+            }
+        }
+        for (i = pos; str1[i + str3_len] != '\0'; i++) {
+            str1[i] = str1[i + str3_len];
+        }
+        str1[i] = '\0';
+    }
+}
+
+void main()
+{
+    int a,b;
+    char str1[100],str2[100],str3[100];
+
+    printf("Enter the first string: ");
+    gets(str1);
+
+    printf("Enter the second string: ");
+    gets(str2);
+
+    printf("The first string is %s. \n",str1);
+    printf("The second string is %s. \n",str2);
+
+    // String Length
+
+    printf("The length of String 1 is %d. \n",string_length(str1));
+    printf("The length of String 2 is %d. \n",string_length(str2));
+
+    // String Concatenation
+
+    string_concat(str1, str2);
+
+    // String Comparison
+
+    string_comp(str1, str2);
+
+    // String Insertion
+
+    printf("Enter the position at which you would like to insert string 2 into string 1: ");
+    scanf("%d",&a);
+
+    string_insert(str1, str2, a);
+
+    printf("Enter the position at which you would like to check for deletion substring: ");
+    scanf("%d",&b);
+
+    printf("Enter the part of the string that you want to delete from string 1: ");
+    getchar(); // Clear the newline character from the input buffer
+    fgets(str3, sizeof(str3), stdin); // Use fgets instead of gets for safer input
+
+    string_destroy(str1, str3, b);
+}
diff --git a/DS/C/Lab/Week2/StructureStudent.c b/DS/C/Lab/Week2/StructureStudent.c
new file mode 100644
index 0000000..f370356
--- /dev/null
+++ b/DS/C/Lab/Week2/StructureStudent.c
@@ -0,0 +1,60 @@
+#include <stdio.h>
+
+typedef struct {
+    char name[50];
+    int roll_no;
+    char grade;
+} student;
+
+void read_students(student students[], int n) {
+    for (int i = 0; i < n; i++) {
+        printf("Enter details for student %d:\n", i + 1);
+        printf("Name: ");
+        scanf("%s", students[i].name);
+        printf("Roll No: ");
+        scanf("%d", &students[i].roll_no);
+        printf("Grade: ");
+        scanf(" %c", &students[i].grade);
+    }
+}
+
+void display_students(student students[], int n) {
+    printf("\nStudent Information:\n");
+    for (int i = 0; i < n; i++) {
+        printf("Name: %s, Roll No: %d, Grade: %c\n", students[i].name, students[i].roll_no, students[i].grade);
+    }
+}
+
+void sort_students_by_roll(student students[], int n) {
+    student temp;
+    for (int i = 0; i < n - 1; i++) {
+        for (int j = i + 1; j < n; j++) {
+            if (students[i].roll_no > students[j].roll_no) {
+                temp = students[i];
+                students[i] = students[j];
+                students[j] = temp;
+            }
+        }
+    }
+}
+
+int main() {
+    int n;
+
+    printf("Enter the number of students: ");
+    scanf("%d", &n);
+
+    student students[n];
+
+    read_students(students, n);
+
+    printf("\nBefore sorting:\n");
+    display_students(students, n);
+
+    sort_students_by_roll(students, n);
+
+    printf("\nAfter sorting by roll number:\n");
+    display_students(students, n);
+
+    return 0;
+}
diff --git a/DS/C/Lab/Week2/StudentRecordsFile.c b/DS/C/Lab/Week2/StudentRecordsFile.c
new file mode 100644
index 0000000..d00ee6f
--- /dev/null
+++ b/DS/C/Lab/Week2/StudentRecordsFile.c
@@ -0,0 +1,73 @@
+#include <stdio.h>
+
+typedef struct {
+    char name[50];
+    int roll_no;
+    char grade;
+    char branch[50];
+} Student;
+
+void write_student_records(const char filename[], Student students[], int n) {
+    FILE *file = fopen(filename, "w");
+    if (file == NULL) {
+        printf("Error opening file.\n");
+        return;
+    }
+
+    for (int i = 0; i < n; i++) {
+        fprintf(file, "%s %d %c %s\n", students[i].name, students[i].roll_no, students[i].grade, students[i].branch);
+    }
+
+    fclose(file);
+}
+
+void store_branchwise_records(const char filename[]) {
+    FILE *file = fopen(filename, "r");
+    if (file == NULL) {
+        printf("Error opening file.\n");
+        return;
+    }
+
+    Student student;
+    char branch_filename[50];
+
+    while (fscanf(file, "%s %d %c %s", student.name, &student.roll_no, &student.grade, student.branch) != EOF) {
+        sprintf(branch_filename, "%s.txt", student.branch);
+        FILE *branch_file = fopen(branch_filename, "a");
+        if (branch_file == NULL) {
+            printf("Error opening branch file.\n");
+            continue;
+        }
+        fprintf(branch_file, "%s %d %c\n", student.name, student.roll_no, student.grade);
+        fclose(branch_file);
+    }
+
+    fclose(file);
+}
+
+int main() {
+    int n;
+    printf("Enter the number of students: ");
+    scanf("%d", &n);
+
+    Student students[n];
+
+    for (int i = 0; i < n; i++) {
+        printf("Enter details for student %d:\n", i + 1);
+        printf("Name: ");
+        scanf("%s", students[i].name);
+        printf("Roll No: ");
+        scanf("%d", &students[i].roll_no);
+        printf("Grade: ");
+        scanf(" %c", &students[i].grade);
+        printf("Branch: ");
+        scanf("%s", students[i].branch);
+    }
+
+    write_student_records("students.txt", students, n);
+    store_branchwise_records("students.txt");
+
+    printf("Records stored branch-wise in separate files.\n");
+
+    return 0;
+}
diff --git a/DS/C/Lab/Week2/timehandler.c b/DS/C/Lab/Week2/timehandler.c
new file mode 100644
index 0000000..9fc1677
--- /dev/null
+++ b/DS/C/Lab/Week2/timehandler.c
@@ -0,0 +1,68 @@
+#include <stdio.h>
+
+typedef struct {
+    int hour;
+    int min;
+    int sec;
+} Time;
+
+void read_time(Time *t) {
+    scanf("%d %d %d", &t->hour, &t->min, &t->sec);
+}
+
+void display_time(Time t) {
+    printf("%02d:%02d:%02d\n", t.hour, t.min, t.sec);
+}
+
+Time add_time(Time t1, Time t2) {
+    Time result;
+    result.sec = t1.sec + t2.sec;
+    result.min = t1.min + t2.min + result.sec / 60;
+    result.sec %= 60;
+    result.hour = t1.hour + t2.hour + result.min / 60;
+    result.min %= 60;
+    result.hour %= 24;
+    return result;
+}
+
+Time diff_time(Time t1, Time t2) {
+    Time result;
+    int total_sec1 = t1.hour * 3600 + t1.min * 60 + t1.sec;
+    int total_sec2 = t2.hour * 3600 + t2.min * 60 + t2.sec;
+    int diff_sec = total_sec1 - total_sec2;
+
+    if (diff_sec < 0) {
+        diff_sec += 24 * 3600;
+    }
+
+    result.hour = diff_sec / 3600;
+    result.min = (diff_sec % 3600) / 60;
+    result.sec = diff_sec % 60;
+    return result;
+}
+
+int main() {
+    Time t1, t2, sum, difference;
+
+    printf("Enter the first time (hours minutes seconds): ");
+    read_time(&t1);
+
+    printf("Enter the second time (hours minutes seconds): ");
+    read_time(&t2);
+
+    printf("First time: ");
+    display_time(t1);
+
+    printf("Second time: ");
+    display_time(t2);
+
+    sum = add_time(t1, t2);
+    printf("Sum of times: ");
+    display_time(sum);
+
+    difference = diff_time(t1, t2);
+    printf("Difference between times: ");
+    display_time(difference);
+
+    return 0;
+}