added strings topic

STRINGS/c or cpp/Palindrome.c

@@ -0,0 +1,30 @@
+
+#include <stdio.h>
+#include <string.h>
+
+// A function to check if a string str is palindrome
+void isPalindrome(char str[])
+{
+    // Start from leftmost and rightmost corners of str
+    int l = 0;
+    int h = strlen(str) - 1;
+
+    // Keep comparing characters while they are same
+    while (h > l)
+    {
+        if (str[l++] != str[h--])
+        {
+            printf("%s is Not Palindrome", str);
+            return;
+        }
+    }
+    printf("%s is palindrome", str);
+}
+
+// Driver program to test above function
+int main()
+{
+    isPalindrome("abba");
+    isPalindrome("abbccbba");
+    return 0;
+}