Can this please be done C code!

Summary: Given integer values for red, green, and blue, subtract the gray from each value. Computers represent color by combining the sub-colors red, green, and blue (rgb). Each sub-color's value can range from 0 to 255 . Thus (255,0,0) is bright red, (130,0,130) is a medium purple, (0,0,0) is black, (255,255,255) is white, and (40,40,40) is a dark gray. (130,50, 130 ) is a faded purple, due to the (50,50,50) gray part. (In other words, equal amounts of red, green, blue yield gray). Given values for red, green, and blue, remove the gray part