var readDate = a=>{r=[];var b=[d,f,e]=a.split`

`.map(n=>n.split``);Array(Math.max(...b.map(n=>n.length))).fill().map((m,i)=>{(m=f[i])&&m!=" "&&(c=m);[d,e].map(m=>(g=m[i])&&g!=" "&&(r[g-1]=c))}),r.splice(4,0,"-"),r.splice(7,0,"-");return r.join``};

​

[

  `2  3  1  4

0  1  2  3  7

5     67    8`,

  `2  3  1     4

0  1  2  4  5

   5  67 8`,

  `     1234

1    2

5678`,

  `   1     3  24

0  1  2  7  8

57    6     8`,

  `2   4   1   3

0   1   2   6

5       678`,

  `      1 4 2 3

0 1 2 3 4 5 6 8

6 5 7         8`

].map((a)=>console.log(a, readDate(a)))