Programs on strings.

• Write a Program to calculate length of the string using strlen() function.
• Write a program to reverse a string using strrev() function.
• Write a program to reverse a string without using strrev() function.
• Write a program to transform a string to its uppercase.
• Write a program to sort strings in dictionary order.
• Write a program to check whether a string is palindrome or not.
• Write a program to count words in a sentence.
• Write a program to reverse a string word wise.
• Write a program to remove adjacent duplicate characters from a string.
• Write a program to check whether a given string is alphanumeric or not..
• Write a program to count vowels in a given string.
• Write a program to find a substring in a given string .