Code should executable on the Linux server

no need complicated syntax

in c

Ask user to enter first and last name. Use a single scanf command to read in the first and last name. Convert all letters to uppercase and print out the converted name. The user can use lower case or some combination of lower and upper case, and your program must output the name with the correct letters all in upper case. You may not use any C library functions other than scanf, printf, and sprintf. Note that this restriction means that the toupper function may not be used