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[Apprentice123]

What is wrong?

      .data
nome: .asciiz "test\n"


      .text
      .globl main
      
uppercase: addi $v0, $zero, 4
      lb $t2, 0($a0)        
      beq $t2, $0, exit        
      blt $t2, 97, next
      bgt $t2, 122, next
      sub $t2, $t2, 32      
      sb $t2, 0($a0)


next:
    addi $a0, $a0, 1
    j uppercase
    
exit:
    #jr $ra
    j main
    
main:
    la $a0, nome
    j uppercase
    li $v0, 10
    syscall