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You can use Global variable Action. Salesforce will generate URL for you. You don't have to do Anything.. This button will redirect to Account Edit page..

You just need to pass record Id

<apex:commandButton value="EDIT" action="{!URLFOR($Action.Account.Edit, Account.Id)}" />

Refer this documentation

Another option you could use this

<apex:outputLink value="{!LEFT($CurrentPage.URL,FIND('/',$CurrentPage.URL,9))+relatedto.Id+'/e?retURL=%2F'+o.Id}">Edit</apex:outputLink>

Refer this answer

You can use Global variable Action. Salesforce will generate URL for you. You don't have to do Anything.. This button will redirect to Account Edit page..

You just need to pass record Id

<apex:commandButton value="EDIT" action="{!URLFOR($Action.Account.Edit, Account.Id)}" />

Refer this documentation

Another option you could use this

<apex:outputLink value="{!LEFT($CurrentPage.URL,FIND('/',$CurrentPage.URL,9))+relatedto.Id+'/e?retURL=%2F'+o.Id}">Edit</apex:outputLink>

Refer this answer

You can use Global variable Action. Salesforce will generate URL for you. You don't have to do Anything.. This button will redirect to Account Edit page..

You just need to pass record Id

<apex:commandButton value="EDIT" action="{!URLFOR($Action.Account.Edit, Account.Id)}" />

Refer this documentation

Another option you could use this

<apex:outputLink value="{!LEFT($CurrentPage.URL,FIND('/',$CurrentPage.URL,9))+relatedto.Id+'/e'}">Edit</apex:outputLink>

Refer this answer

You can use Global variable Action. Salesforce will generate URL for you. You don't have to do Anything.. This button will redirect to Account Edit page..

You just need to pass record Id

<apex:commandButton value="EDIT" action="{!URLFOR($Action.Account.Edit, Account.Id)}" />

Refer this documentation

Another option you could use this

<apex:outputLink value="{!LEFT($CurrentPage.URL,FIND('/',$CurrentPage.URL,9))+relatedto.Id+'/e?retURL=%2F'+o.Id}">Edit</apex:outputLink>

Refer this answer

You can use Global variable Action. Salesforce will generate URL for you. You don't have to do Anything.. This button will redirect to Account Edit page..

You just need to pass record Id

<apex:commandButton value="EDIT" action="{!URLFOR($Action.Account.Edit, Account.Id)}" />

Refer this documentation

Another option you could use this

<apex:outputLink value="{!LEFT($CurrentPage.URL,FIND('/',$CurrentPage.URL,9))+relatedto.Id}">Link</apex:outputLink>

You can use Global variable Action. Salesforce will generate URL for you. You don't have to do Anything.. This button will redirect to Account Edit page..

You just need to pass record Id

<apex:commandButton value="EDIT" action="{!URLFOR($Action.Account.Edit, Account.Id)}" />

Refer this documentation

Another option you could use this

<apex:outputLink value="{!LEFT($CurrentPage.URL,FIND('/',$CurrentPage.URL,9))+relatedto.Id+'/e'}">Edit</apex:outputLink>

Refer this answer