Write a C program to convert string from lowercase to uppercase string using loop. How to convert string from lowercase to uppercase using for loop in C programming. C program to convert lowercase to uppercase string using strupr() string function. Example: Input Input string: I love Code forwin. Output I LOVE CODE FORWIN. 3.2 Write a C program to concatenate two strings in single string. How to concatenate two strings to one without using strcat() library function. Example: Input Input stringl: I love Input string2: Codeforwin Output Concatenated string: I love Codeforwin