added string manipulation in C

string manipulation

@@ -0,0 +1,88 @@
+#include <stdio.h>
+
+int main(void) {
+    int ch = 1;
+    while (ch != 5) {
+        printf("MENU OPTIONS:\n1. String concatenation\n2. String comparison\n3. String length\n4. String copy\n5. Exit\n");
+        printf("Enter choice: ");
+        scanf("%d", &ch);
+
+        // Initializing strings
+        char str1[100];
+        char str2[100];
+
+        if (ch == 1) {
+            char str[100];
+            printf("Enter first string: ");
+            scanf("%s", str1);
+            printf("Enter second string: ");
+            scanf("%s", str2);
+
+            // Printing original strings
+            printf("Original strings: %s, %s\n", str1, str2);
+
+            // Performing operation
+            int i;
+            for (i = 0; str1[i] != '\0'; i++) {
+                str[i] = str1[i];
+            }
+            int index = i;
+            for (i = 0; str2[i] != '\0'; i++) {
+                str[index+i] = str2[i];
+            }
+
+            printf("Concatenated string: %s\n", str);
+        }
+        else if (ch == 2) {
+            printf("Enter first string: ");
+            scanf("%s", str1);
+            printf("Enter second string: ");
+            scanf("%s", str2);  
+
+            int flag = 0;
+
+            for (int i = 0; str1[i] != '\0'; i++) {
+                if (str1[i] != str2[i]) {
+                    flag = 1;
+                    break;
+                }
+            }
+
+            if (flag) {
+                printf("Strings are not equal\n");
+            }
+            else {
+                printf("Strings are equal\n");
+            }
+        }
+        else if (ch == 3) {
+            printf("Enter string: ");
+            scanf("%s", str1);
+
+            int count = 0;
+            for (int i = 0; str1[i] != '\0'; i++) {
+                count++;
+            }
+
+            printf("Length of string: %d\n", count);
+        }
+        else if (ch == 4) {
+            printf("Enter string: ");
+            scanf("%s", str1);
+
+            printf("Original string: %s(%p)\n", str1, &str1);
+
+            for (int i = 0; str1[i] != '\0'; i++) {
+                str2[i] = str1[i];
+            }
+
+            printf("Copied string: %s(%p)\n", str2, &str2);
+        }
+        else if (ch != 5) {
+            printf("\nInvalid option\n\n");
+        }
+    }
+
+    printf("Exit..\n");
+    return 0;
+}