Please write in C language

Write a program that translates an alphabetic phone number into numeric form: Enter phone number: CALLATT 2255288 (In case you don't have a telephone nearby, here are the letters on the keys: 2:ABC. 3:DEF. 4:GHI. 5:JKL, 6:MNO. 7:PRS. 8:TUV. 9:WXY) If the original phone number contains non-alphabetic characters (digits or punctuation, for example), leave them unchanged: Enter phone number: 1-800-COL-LECT 1-800-265-5328 You may assume that any letters entered by the user is upper case. (use if/else statements, getchar() and putchar() for reading the entries and writing the substitutes, respectively. Please note, as an example, you can use putchar('1') to write 1 or putchar(ch) to write the character stored in ch)