Please convert the following C code into Mars MIPS code:

if (j < 0x80) {

 // j fits in 7 bits, expand to 8 bits // n = j

} else if (j <= 0x7FF) { 

 // j fits in 11 bits, expand to 16 bits // b = low 6 bits of j // a = next 5 bits of j // n = 110 a 10 b // 5 6 bits in

// j = aaaaa bbbbbb

// 3 5 2 6 bits out

// n = 110 aaaaa 10 bbbbbb

} else if (j <= 0xFFFF) {

// j fits in 16 bits, expand to 24 bits // c = low 6 bits of j // b = next 6 bits of j // a = next 4 bits of j 

// n = 1110 a 10 b 10 c 

// 4 6 6 bits in

// j = aaaa bbbbbb cccccc

// 4 4 2 6 2 6 bits out

// n = 1110 aaaa 10 bbbbbb 10 cccccc

// 4 4 2 6 2 6 bits out

// n = 1110 aaaa 10 bbbbbb 10 cccccc

} else if (j <= 0x10FFFF) { // j fits in 21 bits, expand to 32 bits // d = low 6 bits of j // c = next 6 bits of j // b = next 6 bits of j // a = next 3 bits of j // n = 11110 a 10 b 10 c 10 d 

// 3 6 6 6 bits in

// j = aaa bbbbbb cccccc dddddd

// 5 3 2 6 2 6 2 6 bits out // n = 11110 aaa 10 bbbbbb 10 cccccc 10 dddddd 

 } else {

 // j is outside the UTF-8 range of character codes // n = 0xFFFFFFFF 

}