Weird gap between lights

I have started learning to code shaders a couple of weeks ago. I wanted to create a basic shader for my 2D project. But while doing it, I was faced with the problem shown here

Here is my code(part of it): Code

Code (CSharp):

1. struct Light{
2.    float4 position;
3.    float size;
4. };
5.  
6. //appdata and v2f
7.  
8. StructuredBuffer<Light> _LightData;
9. fixed4 frag (v2f i) : SV_Target{
10.    float _distance = 0;
11.    fixed4 color = tex2D(_MainTex, i.uv);
12.    for(int a = 0; a < _LightArraySize;a++){
13.        if(_distance>0){
14.            if(_distance > distance(i.worldSpacePos, _LightData[a].position+0.5)/_LightData[a].size){
15.                _distance = distance(i.worldSpacePos, _LightData[a].position+0.5)/_LightData[a].size;
16.            }
17.        }else{
18.            _distance = distance(i.worldSpacePos, _LightData[a].position+0.5)/_LightData[a].size;
19.        }
20.    }
21.    return fixed4(color.x - _distance, color.y - _distance, color.z - _distance, color.w);
22. }

 

You forgot to tell what your problem, what effect you tried to achieve, did provide a screenshot of it and so on.

Also subtracting distance from color is not how you blend color based on distance.