Solution Review: Merge Two Sorted Arrays

fn merge_sorted_arrays(array1: &Vec<i32>, array2: &Vec<i32>) -> Vec<i32>{
    let mut array3: Vec<i32>= vec![0; array1.len()+array2.len()];
    let mut i = 0; 
    let mut j = 0; 
    let mut k = 0; 
    while i<array1.len() && j<array2.len() {
        if array1[i] <= array2[j]{
            array3[k] = array1[i];
            i+=1; 
            k+=1;
        }
        else{
            array3[k] = array2[j]; 
            j+=1; 
            k+=1;
        }
    }

    while i<array1.len(){
        array3[k] = array1[i];
        i+=1;
        k+=1;
    }
    while j<array2.len(){
        array3[k] = array2[j];
        j+=1; 
        k+=1;
    }
    return array3;
}